@article{fdi:010096330,
  title = {{N}utrient enrichment by poultry biochar reshapes soil microbial networks, reducing interaction complexity in tropical sandy soils},
  author = {{L}ima, {A}. {V}. and da {C}osta, {D}. {P}. and {D}uda, {G}. {P}. and de {B}arros, {J}. {A}. and {S}antos, {R}. {D}. and da {M}ota, {S}. {E}. {O}. and {L}ima, {J}. {R}. {D}. and da {S}ilva, {V}. {P}. and {L}opes, {M}. {H}. {L}. and {H}ammecker, {C}laude and {P}ereira, {A}. {P}. {D}. and {M}endes, {L}. {W}. and {A}raujo, {A}. {S}. {F}. and de {M}edeiros, {E}. {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}urpose {T}his study evaluated how poultry manure-derived biochar influences the structure, diversity, and co-occurrence networks of soil bacterial communities in nutrient-poor tropical sandy soils. {W}e examined the trade-off between improved soil fertility and potential simplification of microbial networks, testing the hypothesis that high biochar rates would enhance nutrient availability but reduce microbial complexity and diversity. {M}ethods {A} field experiment was conducted over two years in sandy soils of northeastern {B}razil, applying poultry biochar. {W}e used six treatments: (a) control (no amendments), (b) low-rate biochar ({B}io_10t = 10 t ha(-1)), (c) high-rate biochar ({B}io_40t = 40 t ha(-1)), (d) chicken manure ({E}.{A}v = 5 t ha(-1)), (e) synthetic mineral fertilizer ({M}ineral = {NPK}), and (f) poultry manure ({C}.{A}v = 10 t ha(-1)). {S}oil chemical properties were assessed, and bacterial communities were analyzed using 16 {S} r{RNA} gene sequencing. {N}etwork analyses were performed using {S}par{CC} and {N}et{C}o{M}i, and multivariate statistics determined key environmental drivers. {R}esults {H}igh biochar inputs increased organic {C}, {P}, and {K} levels, leading to a distinct shift in microbial community structure. {H}owever, this nutrient enrichment reduced amplicon sequence variants richness by 22.4% (from 3,250 to 2,521) and {S}hannon diversity by 3.6% (from 7.16 to 6.90) relative to the control. {N}etwork analysis showed substantial simplification of microbial interactions: the control treatment had 3,116 co-occurrence edges, which fell to 1,423 under low biochar ({B}io_10t) and 1,849 under high biochar ({B}io_40t)-reductions of 54% and 40%, respectively. {C}onclusions {O}ur findings underscore a trade-off: while poultry biochar effectively enhances soil fertility, excessive application may disrupt microbial diversity and interaction networks, potentially compromising long-term soil resilience. {T}hese results highlight the need to optimize biochar rates to balance immediate fertility gains with preservation of microbial ecological stability in fragile sandy soils. [{GRAPHICS}] .},
  keywords = {{B}iocarbon ; {P}haseolus vulgaris ; {S}oil microbiome ; {O}rganic amendments ; {C}o-occurrence networks ; {M}icrobial diversity ; {BRESIL}},
  booktitle = {},
  journal = {{J}ournal of {S}oil {S}cience and {P}lant {N}utrition},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[12 p.]},
  ISSN = {0718-9508},
  year = {2026},
  DOI = {10.1007/s42729-026-03005-1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010096330},
}